tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * drivers/video/geode/gx1fb_core.c
4 * -- Geode GX1 framebuffer driver
5 *
6 * Copyright (C) 2005 Arcom Control Systems Ltd.
7 */
8
9#include <linux/aperture.h>
10#include <linux/module.h>
11#include <linux/kernel.h>
12#include <linux/errno.h>
13#include <linux/string.h>
14#include <linux/mm.h>
15#include <linux/delay.h>
16#include <linux/fb.h>
17#include <linux/init.h>
18#include <linux/pci.h>
19
20#include "geodefb.h"
21#include "display_gx1.h"
22#include "video_cs5530.h"
23
24static char mode_option[32] = "640x480-16@60";
25static int crt_option = 1;
26static char panel_option[32] = "";
27
28/* Modes relevant to the GX1 (taken from modedb.c) */
29static const struct fb_videomode gx1_modedb[] = {
30 /* 640x480-60 VESA */
31 { NULL, 60, 640, 480, 39682, 48, 16, 33, 10, 96, 2,
32 0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
33 /* 640x480-75 VESA */
34 { NULL, 75, 640, 480, 31746, 120, 16, 16, 01, 64, 3,
35 0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
36 /* 640x480-85 VESA */
37 { NULL, 85, 640, 480, 27777, 80, 56, 25, 01, 56, 3,
38 0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
39 /* 800x600-60 VESA */
40 { NULL, 60, 800, 600, 25000, 88, 40, 23, 01, 128, 4,
41 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
42 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
43 /* 800x600-75 VESA */
44 { NULL, 75, 800, 600, 20202, 160, 16, 21, 01, 80, 3,
45 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
46 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
47 /* 800x600-85 VESA */
48 { NULL, 85, 800, 600, 17761, 152, 32, 27, 01, 64, 3,
49 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
50 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
51 /* 1024x768-60 VESA */
52 { NULL, 60, 1024, 768, 15384, 160, 24, 29, 3, 136, 6,
53 0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
54 /* 1024x768-75 VESA */
55 { NULL, 75, 1024, 768, 12690, 176, 16, 28, 1, 96, 3,
56 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
57 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
58 /* 1024x768-85 VESA */
59 { NULL, 85, 1024, 768, 10582, 208, 48, 36, 1, 96, 3,
60 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
61 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
62 /* 1280x960-60 VESA */
63 { NULL, 60, 1280, 960, 9259, 312, 96, 36, 1, 112, 3,
64 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
65 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
66 /* 1280x960-85 VESA */
67 { NULL, 85, 1280, 960, 6734, 224, 64, 47, 1, 160, 3,
68 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
69 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
70 /* 1280x1024-60 VESA */
71 { NULL, 60, 1280, 1024, 9259, 248, 48, 38, 1, 112, 3,
72 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
73 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
74 /* 1280x1024-75 VESA */
75 { NULL, 75, 1280, 1024, 7407, 248, 16, 38, 1, 144, 3,
76 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
77 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
78 /* 1280x1024-85 VESA */
79 { NULL, 85, 1280, 1024, 6349, 224, 64, 44, 1, 160, 3,
80 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
81 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
82};
83
84static int gx1_line_delta(int xres, int bpp)
85{
86 int line_delta = xres * (bpp >> 3);
87
88 if (line_delta > 2048)
89 line_delta = 4096;
90 else if (line_delta > 1024)
91 line_delta = 2048;
92 else
93 line_delta = 1024;
94 return line_delta;
95}
96
97static int gx1fb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
98{
99 struct geodefb_par *par = info->par;
100
101 /* Maximum resolution is 1280x1024. */
102 if (var->xres > 1280 || var->yres > 1024)
103 return -EINVAL;
104
105 if (par->panel_x && (var->xres > par->panel_x || var->yres > par->panel_y))
106 return -EINVAL;
107
108 /* Only 16 bpp and 8 bpp is supported by the hardware. */
109 if (var->bits_per_pixel == 16) {
110 var->red.offset = 11; var->red.length = 5;
111 var->green.offset = 5; var->green.length = 6;
112 var->blue.offset = 0; var->blue.length = 5;
113 var->transp.offset = 0; var->transp.length = 0;
114 } else if (var->bits_per_pixel == 8) {
115 var->red.offset = 0; var->red.length = 8;
116 var->green.offset = 0; var->green.length = 8;
117 var->blue.offset = 0; var->blue.length = 8;
118 var->transp.offset = 0; var->transp.length = 0;
119 } else
120 return -EINVAL;
121
122 /* Enough video memory? */
123 if (gx1_line_delta(var->xres, var->bits_per_pixel) * var->yres > info->fix.smem_len)
124 return -EINVAL;
125
126 /* FIXME: Check timing parameters here? */
127
128 return 0;
129}
130
131static int gx1fb_set_par(struct fb_info *info)
132{
133 struct geodefb_par *par = info->par;
134
135 if (info->var.bits_per_pixel == 16)
136 info->fix.visual = FB_VISUAL_TRUECOLOR;
137 else
138 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
139
140 info->fix.line_length = gx1_line_delta(info->var.xres, info->var.bits_per_pixel);
141
142 par->dc_ops->set_mode(info);
143
144 return 0;
145}
146
147static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
148{
149 chan &= 0xffff;
150 chan >>= 16 - bf->length;
151 return chan << bf->offset;
152}
153
154static int gx1fb_setcolreg(unsigned regno, unsigned red, unsigned green,
155 unsigned blue, unsigned transp,
156 struct fb_info *info)
157{
158 struct geodefb_par *par = info->par;
159
160 if (info->var.grayscale) {
161 /* grayscale = 0.30*R + 0.59*G + 0.11*B */
162 red = green = blue = (red * 77 + green * 151 + blue * 28) >> 8;
163 }
164
165 /* Truecolor has hardware independent palette */
166 if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
167 u32 *pal = info->pseudo_palette;
168 u32 v;
169
170 if (regno >= 16)
171 return -EINVAL;
172
173 v = chan_to_field(red, &info->var.red);
174 v |= chan_to_field(green, &info->var.green);
175 v |= chan_to_field(blue, &info->var.blue);
176
177 pal[regno] = v;
178 } else {
179 if (regno >= 256)
180 return -EINVAL;
181
182 par->dc_ops->set_palette_reg(info, regno, red, green, blue);
183 }
184
185 return 0;
186}
187
188static int gx1fb_blank(int blank_mode, struct fb_info *info)
189{
190 struct geodefb_par *par = info->par;
191
192 return par->vid_ops->blank_display(info, blank_mode);
193}
194
195static int gx1fb_map_video_memory(struct fb_info *info, struct pci_dev *dev)
196{
197 struct geodefb_par *par = info->par;
198 unsigned gx_base;
199 int fb_len;
200 int ret;
201
202 gx_base = gx1_gx_base();
203 if (!gx_base)
204 return -ENODEV;
205
206 ret = pci_enable_device(dev);
207 if (ret < 0)
208 return ret;
209
210 ret = pci_request_region(dev, 0, "gx1fb (video)");
211 if (ret < 0)
212 return ret;
213 par->vid_regs = pci_ioremap_bar(dev, 0);
214 if (!par->vid_regs)
215 return -ENOMEM;
216
217 if (!request_mem_region(gx_base + 0x8300, 0x100, "gx1fb (display controller)"))
218 return -EBUSY;
219 par->dc_regs = ioremap(gx_base + 0x8300, 0x100);
220 if (!par->dc_regs)
221 return -ENOMEM;
222
223 if ((fb_len = gx1_frame_buffer_size()) < 0)
224 return -ENOMEM;
225 info->fix.smem_start = gx_base + 0x800000;
226 info->fix.smem_len = fb_len;
227 info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len);
228 if (!info->screen_base)
229 return -ENOMEM;
230
231 dev_info(&dev->dev, "%d Kibyte of video memory at 0x%lx\n",
232 info->fix.smem_len / 1024, info->fix.smem_start);
233
234 return 0;
235}
236
237static int parse_panel_option(struct fb_info *info)
238{
239 struct geodefb_par *par = info->par;
240
241 if (strcmp(panel_option, "") != 0) {
242 int x, y;
243 char *s;
244 x = simple_strtol(panel_option, &s, 10);
245 if (!x)
246 return -EINVAL;
247 y = simple_strtol(s + 1, NULL, 10);
248 if (!y)
249 return -EINVAL;
250 par->panel_x = x;
251 par->panel_y = y;
252 }
253 return 0;
254}
255
256static const struct fb_ops gx1fb_ops = {
257 .owner = THIS_MODULE,
258 .fb_check_var = gx1fb_check_var,
259 .fb_set_par = gx1fb_set_par,
260 .fb_setcolreg = gx1fb_setcolreg,
261 .fb_blank = gx1fb_blank,
262 /* No HW acceleration for now. */
263 .fb_fillrect = cfb_fillrect,
264 .fb_copyarea = cfb_copyarea,
265 .fb_imageblit = cfb_imageblit,
266};
267
268static struct fb_info *gx1fb_init_fbinfo(struct device *dev)
269{
270 struct geodefb_par *par;
271 struct fb_info *info;
272
273 /* Alloc enough space for the pseudo palette. */
274 info = framebuffer_alloc(sizeof(struct geodefb_par) + sizeof(u32) * 16, dev);
275 if (!info)
276 return NULL;
277
278 par = info->par;
279
280 strcpy(info->fix.id, "GX1");
281
282 info->fix.type = FB_TYPE_PACKED_PIXELS;
283 info->fix.type_aux = 0;
284 info->fix.xpanstep = 0;
285 info->fix.ypanstep = 0;
286 info->fix.ywrapstep = 0;
287 info->fix.accel = FB_ACCEL_NONE;
288
289 info->var.nonstd = 0;
290 info->var.activate = FB_ACTIVATE_NOW;
291 info->var.height = -1;
292 info->var.width = -1;
293 info->var.accel_flags = 0;
294 info->var.vmode = FB_VMODE_NONINTERLACED;
295
296 info->fbops = &gx1fb_ops;
297 info->flags = FBINFO_DEFAULT;
298 info->node = -1;
299
300 info->pseudo_palette = (void *)par + sizeof(struct geodefb_par);
301
302 info->var.grayscale = 0;
303
304 /* CRT and panel options */
305 par->enable_crt = crt_option;
306 if (parse_panel_option(info) < 0)
307 printk(KERN_WARNING "gx1fb: invalid 'panel' option -- disabling flat panel\n");
308 if (!par->panel_x)
309 par->enable_crt = 1; /* fall back to CRT if no panel is specified */
310
311 if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
312 framebuffer_release(info);
313 return NULL;
314 }
315 return info;
316}
317
318static int gx1fb_probe(struct pci_dev *pdev, const struct pci_device_id *id)
319{
320 struct geodefb_par *par;
321 struct fb_info *info;
322 int ret;
323
324 ret = aperture_remove_conflicting_pci_devices(pdev, "gx1fb");
325 if (ret)
326 return ret;
327
328 info = gx1fb_init_fbinfo(&pdev->dev);
329 if (!info)
330 return -ENOMEM;
331 par = info->par;
332
333 /* GX1 display controller and CS5530 video device */
334 par->dc_ops = &gx1_dc_ops;
335 par->vid_ops = &cs5530_vid_ops;
336
337 if ((ret = gx1fb_map_video_memory(info, pdev)) < 0) {
338 dev_err(&pdev->dev, "failed to map frame buffer or controller registers\n");
339 goto err;
340 }
341
342 ret = fb_find_mode(&info->var, info, mode_option,
343 gx1_modedb, ARRAY_SIZE(gx1_modedb), NULL, 16);
344 if (ret == 0 || ret == 4) {
345 dev_err(&pdev->dev, "could not find valid video mode\n");
346 ret = -EINVAL;
347 goto err;
348 }
349
350 /* Clear the frame buffer of garbage. */
351 memset_io(info->screen_base, 0, info->fix.smem_len);
352
353 gx1fb_check_var(&info->var, info);
354 gx1fb_set_par(info);
355
356 if (register_framebuffer(info) < 0) {
357 ret = -EINVAL;
358 goto err;
359 }
360 pci_set_drvdata(pdev, info);
361 fb_info(info, "%s frame buffer device\n", info->fix.id);
362 return 0;
363
364 err:
365 if (info->screen_base) {
366 iounmap(info->screen_base);
367 pci_release_region(pdev, 0);
368 }
369 if (par->vid_regs) {
370 iounmap(par->vid_regs);
371 pci_release_region(pdev, 1);
372 }
373 if (par->dc_regs) {
374 iounmap(par->dc_regs);
375 release_mem_region(gx1_gx_base() + 0x8300, 0x100);
376 }
377
378 fb_dealloc_cmap(&info->cmap);
379 framebuffer_release(info);
380
381 return ret;
382}
383
384static void gx1fb_remove(struct pci_dev *pdev)
385{
386 struct fb_info *info = pci_get_drvdata(pdev);
387 struct geodefb_par *par = info->par;
388
389 unregister_framebuffer(info);
390
391 iounmap((void __iomem *)info->screen_base);
392 pci_release_region(pdev, 0);
393
394 iounmap(par->vid_regs);
395 pci_release_region(pdev, 1);
396
397 iounmap(par->dc_regs);
398 release_mem_region(gx1_gx_base() + 0x8300, 0x100);
399
400 fb_dealloc_cmap(&info->cmap);
401
402 framebuffer_release(info);
403}
404
405#ifndef MODULE
406static void __init gx1fb_setup(char *options)
407{
408 char *this_opt;
409
410 if (!options || !*options)
411 return;
412
413 while ((this_opt = strsep(&options, ","))) {
414 if (!*this_opt)
415 continue;
416
417 if (!strncmp(this_opt, "mode:", 5))
418 strscpy(mode_option, this_opt + 5, sizeof(mode_option));
419 else if (!strncmp(this_opt, "crt:", 4))
420 crt_option = !!simple_strtoul(this_opt + 4, NULL, 0);
421 else if (!strncmp(this_opt, "panel:", 6))
422 strscpy(panel_option, this_opt + 6, sizeof(panel_option));
423 else
424 strscpy(mode_option, this_opt, sizeof(mode_option));
425 }
426}
427#endif
428
429static struct pci_device_id gx1fb_id_table[] = {
430 { PCI_VENDOR_ID_CYRIX, PCI_DEVICE_ID_CYRIX_5530_VIDEO,
431 PCI_ANY_ID, PCI_ANY_ID, PCI_BASE_CLASS_DISPLAY << 16,
432 0xff0000, 0 },
433 { 0, }
434};
435
436MODULE_DEVICE_TABLE(pci, gx1fb_id_table);
437
438static struct pci_driver gx1fb_driver = {
439 .name = "gx1fb",
440 .id_table = gx1fb_id_table,
441 .probe = gx1fb_probe,
442 .remove = gx1fb_remove,
443};
444
445static int __init gx1fb_init(void)
446{
447#ifndef MODULE
448 char *option = NULL;
449#endif
450
451 if (fb_modesetting_disabled("gx1fb"))
452 return -ENODEV;
453
454#ifndef MODULE
455 if (fb_get_options("gx1fb", &option))
456 return -ENODEV;
457 gx1fb_setup(option);
458#endif
459 return pci_register_driver(&gx1fb_driver);
460}
461
462static void gx1fb_cleanup(void)
463{
464 pci_unregister_driver(&gx1fb_driver);
465}
466
467module_init(gx1fb_init);
468module_exit(gx1fb_cleanup);
469
470module_param_string(mode, mode_option, sizeof(mode_option), 0444);
471MODULE_PARM_DESC(mode, "video mode (<x>x<y>[-<bpp>][@<refr>])");
472
473module_param_named(crt, crt_option, int, 0444);
474MODULE_PARM_DESC(crt, "enable CRT output. 0 = off, 1 = on (default)");
475
476module_param_string(panel, panel_option, sizeof(panel_option), 0444);
477MODULE_PARM_DESC(panel, "size of attached flat panel (<x>x<y>)");
478
479MODULE_DESCRIPTION("framebuffer driver for the AMD Geode GX1");
480MODULE_LICENSE("GPL");